Stress may be considered as any physical, chemical, or emotional factor that causes bodily or mental unrest, and that may be a factor in causing disease. Physical and chemical factors that can cause stress include trauma, infections, toxins, illnesses, and injuries of any sort. As you get older and your bodily functions decline and your digestive system become less efficient. It begins to function not as optimally, and toxins from residue start to accumulate inside your intestines. Also, toxic chemicals a typical person consumes throughout his or her life can accumulate, and because of various symptoms, such as fatigue, poor skin state, chronic migraine, and pain. Over time these symptoms may lead to all sorts of diseases. Likewise, exercising can produce temporary stress on somebody's functions, but its health benefits are indisputable. It is only when pressure is overwhelming, or poorly managed, that its adverse effects appear. Emotional causes of stress and tension are numerous and varied. While many people associate the term stress with psychological stress, scientists and physicians use this term to denote any force that impairs the stability and balance of bodily functions.